<template>
  <el-container class="home-container">
    <!-- 头部区域 -->
    <el-header>
      <div>
        <img src="../assets/heima.png" />
        <span>电商后台管理系统</span>
      </div>
      <el-button type="info" @click="logout">退出</el-button>
    </el-header>
    <!-- 页面主体区域 -->

    <el-container>
      <!-- 侧边栏 -->
      <el-aside :width="isCollapse ? '64px' : '200px'">
        <!-- 折叠展开按钮条 -->
        <div class="toggle-button" @click="toogleCollapse">|||</div>
        <!-- 侧边栏菜单区域 -->
        <!-- :unique-opened="true"等效 -->
        <!-- 启用router 该模式会在激活导航时以 index 作为 path 进行路由跳转 -->
        <!-- default-active	当前激活菜单的 index -->
        <el-menu background-color="#333744" text-color="#fff" active-text-color="#409eff" unique-opened :collapse="isCollapse" :collapse-transition="false" router :default-active="activePath">
          <!-- 一级菜单区域 -->
          <el-submenu :index="item.id + ''" v-for="item in menulist" :key="item.id">
            <!-- 一级菜单模板区域 -->

            <template slot="title">
              <!-- 图标 -->
              <i :class="iconObj[item.id]"></i>
              <!-- 文本 -->
              <span>{{ item.authName }}</span>
            </template>
            <!-- 二级菜单 -->
            <el-menu-item :index="'/' + subItem.path" v-for="subItem in item.children" :key="subItem.id" @click="saveNavState('/' + subItem.path)">
              <!-- 二级菜单模板区域 -->
              <template slot="title">
                <!-- 图标 -->
                <i class="el-icon-menu"></i>
                <!-- 文本 -->
                <span>{{ subItem.authName }}</span>
              </template>
            </el-menu-item>
          </el-submenu>
        </el-menu>
      </el-aside>

      <!-- 右侧内容主体区域 -->
      <el-main>
        <!-- 子路由区域 -->
        <!-- 路由占位符 -->
        <router-view></router-view>
      </el-main>
    </el-container>
  </el-container>
</template>

<script>
export default {
  data: function() {
    return {
      menulist: [],
      iconObj: {
        '125': 'iconfont icon-users',
        '103': 'iconfont icon-028tijikongjian',
        '101': 'iconfont icon-shangpin',
        '102': 'iconfont icon-danju',
        '145': 'iconfont icon-baobiao'
      },
      // 是否折叠 false代表不折叠
      isCollapse: false,
      // 被激活的链接地址
      activePath: ''
    }
  },
  created: function() {
    this.getMenuList()
    this.activePath = window.sessionStorage.getItem('activePath')
  },
  methods: {
    logout: function() {
     .clear window.sessionStorage()
      this.$router.push('/login')
    },
    // 获取所有的菜单
    getMenuList: async function() {
      const { data: res } = await this.$http.get('menus')
      console.log(res)
      // 获取菜单列表失败
      if (res.meta.status !== 200) return this.$message.error(res.meta.msg)
      // 获取菜单列表成功
      this.menulist = res.data
    },
    // 点击按钮 切换菜单的折叠与展开
    toogleCollapse: function() {
      this.isCollapse = !this.isCollapse
    },
    // 保存链接的激活状态
    saveNavState: function(activePath) {
      window.sessionStorage.setItem('activePath', activePath)
      // 在每次点击二级菜单的时候 要重新保存 created 中的 activePath 值
      this.activePath = activePath
    }
  }
}
</script>

<style lang="less" scoped>
.home-container {
  height: 100%;
}

.el-header {
  background-color: #373d41;
  display: flex;
  justify-content: space-between;
  padding-left: 0;
  align-items: center;
  color: #fff;
  font-size: 20px;
  div {
    display: flex;
    align-items: center;
    span {
      margin-left: 15px;
    }
  }
}

.el-aside {
  background-color: #333744;
  .el-menu {
    border-right: none;
  }
}

.el-main {
  background-color: #eaedf1;
}

// 设置字体图标和字的间距
.iconfont {
  margin-right: 10px;
}

.toggle-button {
  background-color: #4a5064;
  font-size: 10px;
  line-height: 24px;
  color: #fff;
  text-align: center;
  letter-spacing: 0.2em;
  cursor: pointer;
}
</style>
